[HDFS-7192] DN should ignore lazyPersist hint if the writer is not local

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: datanode
• Hadoop Flags: Reviewed
• Assignee: Arpit Agarwal
• Reporter: Arpit Agarwal
• Created: 04/Oct/14 01:47
• Updated: 30/Aug/16 01:41
• Resolved: 30/Jul/15 20:17

Description

The DN should ignore allowLazyPersist hint to DataTransferProtocol#writeBlock if the writer is not local.

Currently we don't restrict memory writes to local clients. For in-cluster clients this is not an issue as single replica writes default to the local DataNode. But clients outside the cluster can still send this hint.